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MediathekManager.js
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const lzma = require('lzma-native');
const EventEmitter = require('events');
const config = require('./config.js');
const fs = require('fs');
const path = require('path');
const request = require('request');
const MediathekIndexer = require('./MediathekIndexer.js');
const REDIS = require('redis');
const StateEmitter = require('./StateEmitter.js');
const requestProgress = require('request-progress');
const utils = require('./utils.js');
class MediathekManager extends EventEmitter {
constructor() {
super();
this.stateEmitter = new StateEmitter(this);
this.mediathekIndexer = new MediathekIndexer();
this.redis = REDIS.createClient(config.redis);
this.mediathekIndexer.on('state', (state) => {
this.stateEmitter.setState(state);
});
}
getCurrentFilmlisteTimestamp(callback) {
this.redis.get('mediathekIndexer:currentFilmlisteTimestamp', (err, reply) => {
if (!err) {
callback(reply);
} else {
callback(0);
}
});
}
getRandomFilmlisteMirror(callback) {
this.stateEmitter.setState('step', 'getRandomFilmlisteMirror');
request.get('https://res.mediathekview.de/akt.xml', (err, response, body) => {
if (err) {
callback(err, null);
} else if (response.statusCode == 200) {
let filmlisteUrlRegex = /<URL>\s*(.*?)\s*<\/URL>/g;
let urlMatches = [];
let match;
while ((match = filmlisteUrlRegex.exec(body)) !== null) {
urlMatches.push(match);
}
let url = urlMatches[Math.floor(Math.random() * urlMatches.length)][1];
callback(null, url);
} else {
callback(new Error('Error statuscode: ' + response.statusCode), null);
}
});
}
checkUpdateAvailable(callback, tries = 3) {
this.stateEmitter.setState({
step: 'checkUpdateAvailable',
try: 4 - tries
});
this.getRandomFilmlisteMirror((err, mirror) => {
if (err) {
callback(err, null);
} else {
this.getCurrentFilmlisteTimestamp((filmlisteTimestamp) => {
request.head(mirror, (err, response, body) => {
if (err) {
if (tries > 0) {
this.checkUpdateAvailable(callback, tries - 1);
} else {
callback(err, null);
}
} else if (response.statusCode == 200 && response.headers['last-modified'] != undefined) {
var lastModified = Math.floor(new Date(response.headers['last-modified']).getTime() / 1000);
let tolerance = 25 * 60; //25 minutes, as not all mirrors update at same time
let available = (lastModified - filmlisteTimestamp) >= tolerance;
this.stateEmitter.setState({
step: 'checkUpdateAvailable',
try: 4 - tries,
available,
available
});
callback(null, available ? mirror : null);
} else if (response.statusCode != 200) {
if (tries > 0) {
this.checkUpdateAvailable(callback, tries - 1);
} else {
callback(new Error('Error statuscode: ' + response.statusCode), null);
}
} else if (response.headers['last-modified'] == undefined) {
if (tries > 0) {
this.checkUpdateAvailable(callback, tries - 1);
} else {
callback(new Error('Server-Response had no last-modified header'), null);
}
}
});
});
}
});
}
updateFilmlisteIfUpdateAvailable(callback) {
this.checkUpdateAvailable((err, mirror) => {
if (err) {
callback(err, false);
} else if (mirror != null) {
this.updateFilmliste(mirror, (err) => {
if (err) {
callback(err, false);
} else {
callback(null, true);
}
});
} else {
callback(null, false);
}
});
}
updateFilmliste(mirror, callback) {
this.stateEmitter.setState('step', 'updateFilmliste');
let file = path.join(config.dataDirectory, 'newFilmliste');
this.downloadFilmliste(mirror, file, (err) => {
if (err) {
callback(err);
} else {
this.mediathekIndexer.indexFilmliste(file, (err) => {
if (err) {
callback(err);
} else {
callback(null);
}
});
}
});
}
downloadFilmliste(mirror, file, callback) {
this.stateEmitter.setState('step', 'downloadFilmliste');
fs.open(file, 'w', (err, fd) => {
let fileStream = fs.createWriteStream(null, {
fd: fd,
autoClose: true
});
let req = requestProgress(request.get(mirror), {
throttle: 500
});
fileStream.on('error', (err) => {
req.abort();
fs.close(fd);
callback(err);
});
req.on('error', (err) => {
fs.close(fd, () => {
callback(err);
});
});
req.on('progress', (state) => {
this.stateEmitter.updateState({
progress: state.percent,
speed: utils.formatBytes(state.speed, 2) + '/s',
transferred: utils.formatBytes(state.size.transferred, 2) + ' / ' + utils.formatBytes(state.size.total, 2),
elapsed: state.time.elapsed + ' seconds',
remaining: state.time.remaining + ' seconds'
});
});
let decompressor = lzma.createDecompressor();
req.pipe(decompressor).pipe(fileStream).on('finish', () => {
fs.close(fd, () => {
callback(null);
});
});
});
}
}
module.exports = MediathekManager;